Change bounding box color according to object position

[walid.brini]

• Hardware Platform (Jetson / GPU) NVIDIA-Jetson-Orin-Nano-Developer-kit
• DeepStream Version 6.3
• JetPack Version (valid for Jetson only) JetPack 5.1.2

Hello i’m trying to change the color of detected objects that are inside the region of interest in the deepstream-test5 , is there a way to implement this?

Thanks in advance

[yuweiw]

You need add a probe function to find this bbox and reconfigure its variables.

typedef struct _NvOSD_RectParams {
...
  NvOSD_ColorParams border_color;
                                /**< Holds the box's border color. */
....
} NvOSD_RectParams;

[walid.brini]

Thanks for your reply. I’m working on the deepstream-test5 example app. Is there a similar example that I can follow with a similar approach ?

[yuweiw]

We have similar implementations in our open-source code that you can refer to. You can refer to the bbox-border-color0 field in the source4_1080p_dec_infer-resnet_tracker_sgie_tiled_display_int8.txt file and the parsed code in the deepstream_config_file_parser.c.

[walid.brini]

I wanted to change the color of the bounding box everytime a detected object enters the roi, i have implemented inside the gie_processing_done_buf_prob Probe function, since i wasn’t able to add a probe directly in the deepstream-test5

	if (appCtx[i]->config.dsanalytics_config.enable){
	    GstPad *src_pad = NULL;
	    GstElement *nvdosd = appCtx[i]->pipeline.common_elements.osd_bin.nvosd;
		src_pad = gst_element_get_static_pad(nvdosd, "src");
	    if (!src_pad)
	    g_print ("Unable to get osd source pad\n");
	    else
	    {
	    gst_pad_add_probe (src_pad, GST_PAD_PROBE_TYPE_BUFFER,
	    osd_sink_pad_buffer_probe, NULL, NULL);
	    gst_object_unref (src_pad);
	    }
	    }
	

1)I was unable to get the osd pad, I think i might be working on the wrong pad?

2)Another question is there a way to access the detected objects inside the roi directly ? or do i have to compare the coordinates of the detected of the objects to the roi box coordinates?

Thanks for the support!

[yuweiw]

As I attached before, deepstream-test5 is using deepstream-app. You can directly use the probe function in the sample_apps\deepstream-app\deepstream_app.c file.

@walid.brini

Another question is there a way to access the detected objects inside the roi directly ?

No. You need to access that with the coordinates or you can set some metadata by yourself to access that.